fbdev: bitblit: bound-check glyph index in bit_putcs*
In the Linux kernel, the following vulnerability has been resolved: fbdev: bitblit: bound-check glyph index in bit_putcs* bit_putcs_aligned()/unaligned() derived the glyph pointer from the character value masked by 0xff/0x1ff, which may exceed the actual font's glyph count and read past the end of the built-in font array. Clamp the index to the actual glyph count before computing the address. This fixes a global out-of-bounds read reported by syzbot.
Noroxi analysis
No Noroxi analysis for this record yet
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We use this product, ask for help- Published
- Dec 7, 2025
- Updated
- Aug 5, 2026
- EPSS
- 0.1% · 3th percentile
- CWE
- —
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Report tools
Action score
28
Monitor
Low priority for now.
- CVSS
- 28 / 40 · 7.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.1%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 7.1
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
—
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 2.6.12affected
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before a10cede006f9614b465cf25609a8753efbfd45ccaffected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 0998a6cb232674408a03e8561dc15aa266b2f53baffected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before db5c9a162d2f42bcc842b76b3d935dcc050a0eecaffected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before c12003bf91fdff381c55ef54fef3e961a5af2545affected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 9ba1a7802ca9a2590cef95b253e6526f4364477faffected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 901f44227072be60812fe8083e83e1533c04eed1affected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before efaf89a75a29b2d179bf4fe63ca62852e93ad620affected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 18c4ef4e765a798b47980555ed665d78b71aeadfaffected · git
- before 2.6.12not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:10 | kernel-abi-stablelists | before 6.12.0-124.35.1.el10_1 | 6.12.0-124.35.1.el10_1 |
| AlmaLinux:10 | kernel-doc | before 6.12.0-124.35.1.el10_1 | 6.12.0-124.35.1.el10_1 |
| AlmaLinux:8 | bpftool | before 4.18.0-553.100.1.el8_10 | 4.18.0-553.100.1.el8_10 |
| AlmaLinux:8 | kernel | before 4.18.0-553.100.1.el8_10 | 4.18.0-553.100.1.el8_10 |
| AlmaLinux:8 | kernel-abi-stablelists | before 4.18.0-553.100.1.el8_10 | 4.18.0-553.100.1.el8_10 |
| AlmaLinux:8 | kernel-core | before 4.18.0-553.100.1.el8_10 | 4.18.0-553.100.1.el8_10 |
| AlmaLinux:8 | kernel-cross-headers | before 4.18.0-553.100.1.el8_10 | 4.18.0-553.100.1.el8_10 |
| AlmaLinux:8 | kernel-debug | before 4.18.0-553.100.1.el8_10 | 4.18.0-553.100.1.el8_10 |
| AlmaLinux:8 | kernel-debug-core | before 4.18.0-553.100.1.el8_10 | 4.18.0-553.100.1.el8_10 |
| AlmaLinux:8 | kernel-debug-devel | before 4.18.0-553.100.1.el8_10 | 4.18.0-553.100.1.el8_10 |
| AlmaLinux:8 | kernel-debug-modules | before 4.18.0-553.100.1.el8_10 | 4.18.0-553.100.1.el8_10 |
| AlmaLinux:8 | kernel-debug-modules-extra | before 4.18.0-553.100.1.el8_10 | 4.18.0-553.100.1.el8_10 |
| AlmaLinux:8 | kernel-devel | before 4.18.0-553.100.1.el8_10 | 4.18.0-553.100.1.el8_10 |
| AlmaLinux:8 | kernel-doc | before 4.18.0-553.100.1.el8_10 | 4.18.0-553.100.1.el8_10 |
| AlmaLinux:8 | kernel-headers | before 4.18.0-553.100.1.el8_10 | 4.18.0-553.100.1.el8_10 |
| AlmaLinux:8 | kernel-modules | before 4.18.0-553.100.1.el8_10 | 4.18.0-553.100.1.el8_10 |
| AlmaLinux:8 | kernel-modules-extra | before 4.18.0-553.100.1.el8_10 | 4.18.0-553.100.1.el8_10 |
| AlmaLinux:8 | kernel-rt | before 4.18.0-553.100.1.rt7.441.el8_10 | 4.18.0-553.100.1.rt7.441.el8_10 |
| AlmaLinux:8 | kernel-rt-core | before 4.18.0-553.100.1.rt7.441.el8_10 | 4.18.0-553.100.1.rt7.441.el8_10 |
| AlmaLinux:8 | kernel-rt-debug | before 4.18.0-553.100.1.rt7.441.el8_10 | 4.18.0-553.100.1.rt7.441.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-core | before 4.18.0-553.100.1.rt7.441.el8_10 | 4.18.0-553.100.1.rt7.441.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-devel | before 4.18.0-553.100.1.rt7.441.el8_10 | 4.18.0-553.100.1.rt7.441.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-modules | before 4.18.0-553.100.1.rt7.441.el8_10 | 4.18.0-553.100.1.rt7.441.el8_10 |
| AlmaLinux:8 | kernel-rt-debug-modules-extra | before 4.18.0-553.100.1.rt7.441.el8_10 | 4.18.0-553.100.1.rt7.441.el8_10 |
+96
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation40Plan
- CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment40Plan
- CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()40Plan
- CVE-2026-74309vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler40Plan
- CVE-2026-74280crypto: marvell/octeontx - fix DMA cleanup using wrong loop index40Plan
- CVE-2026-74279crypto: cavium/cpt - fix DMA cleanup using wrong loop index40Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 0998a6cb232674408a03e8561dc15aa266b2f53b | Vendor (CNA) |
| Linux Linux | 18c4ef4e765a798b47980555ed665d78b71aeadf | Vendor (CNA) |
| Linux Linux | 901f44227072be60812fe8083e83e1533c04eed1 | Vendor (CNA) |
| Linux Linux | 9ba1a7802ca9a2590cef95b253e6526f4364477f | Vendor (CNA) |
| Linux Linux | a10cede006f9614b465cf25609a8753efbfd45cc | Vendor (CNA) |
| Linux Linux | c12003bf91fdff381c55ef54fef3e961a5af2545 | Vendor (CNA) |
| Linux Linux | db5c9a162d2f42bcc842b76b3d935dcc050a0eec | Vendor (CNA) |
| Linux Linux | efaf89a75a29b2d179bf4fe63ca62852e93ad620 | Vendor (CNA) |
| almalinux:bpftool | 4.18.0-553.100.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel | 4.18.0-553.100.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt | 4.18.0-553.100.1.rt7.441.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-core | 4.18.0-553.100.1.rt7.441.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-debug | 4.18.0-553.100.1.rt7.441.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-debug-core | 4.18.0-553.100.1.rt7.441.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-debug-devel | 4.18.0-553.100.1.rt7.441.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-debug-modules | 4.18.0-553.100.1.rt7.441.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-debug-modules-extra | 4.18.0-553.100.1.rt7.441.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-devel | 4.18.0-553.100.1.rt7.441.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-modules | 4.18.0-553.100.1.rt7.441.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-rt-modules-extra | 4.18.0-553.100.1.rt7.441.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| debian:linux | 6.1.159-1 · Debian:12 | Package registry (OSV) |
| red hat:kernel-rt | 0:4.18.0-553.100.1.rt7.441.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-core | 0:4.18.0-553.100.1.rt7.441.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-debug-core | 0:4.18.0-553.100.1.rt7.441.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-debug-debuginfo | 0:4.18.0-553.100.1.rt7.441.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-debug-devel | 0:4.18.0-553.100.1.rt7.441.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-debug-kvm | 0:4.18.0-553.100.1.rt7.441.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-debug-modules | 0:4.18.0-553.100.1.rt7.441.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-debug-modules-extra | 0:4.18.0-553.100.1.rt7.441.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
| red hat:kernel-rt-devel | 0:4.18.0-553.100.1.rt7.441.el8_10 · Red Hat:enterprise_linux:8::nfv | Package registry (OSV) |
+5
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
—
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/0998a6cb232674408a03e8561dc15aa266b2f53b
- git.kernel.org/stable/c/18c4ef4e765a798b47980555ed665d78b71aeadf
- git.kernel.org/stable/c/901f44227072be60812fe8083e83e1533c04eed1
- git.kernel.org/stable/c/9ba1a7802ca9a2590cef95b253e6526f4364477f
- git.kernel.org/stable/c/a10cede006f9614b465cf25609a8753efbfd45cc
- git.kernel.org/stable/c/c12003bf91fdff381c55ef54fef3e961a5af2545
- git.kernel.org/stable/c/db5c9a162d2f42bcc842b76b3d935dcc050a0eec
- git.kernel.org/stable/c/efaf89a75a29b2d179bf4fe63ca62852e93ad620
Vendor advisories and official records. Exploit/PoC links are deliberately left out.